Detect the glibc version in CMake and link librt if it is required.
For the Makefile, unconditionally link librt with no detection.
This commit is contained in:
Nicholas J. Kain
parent
d267c2c44b
commit
51033d3664
100
CMakeLists.txt
100
CMakeLists.txt
@ -2,6 +2,81 @@ project (ndhc)
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cmake_minimum_required (VERSION 2.6)
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####################################
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# Computes the realtionship between two version strings. A version
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# string is a number delineated by '.'s such as 1.3.2 and 0.99.9.1.
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# You can feed version strings with different number of dot versions,
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# and the shorter version number will be padded with zeros: 9.2 <
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# 9.2.1 will actually compare 9.2.0 < 9.2.1.
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#
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# Input: a_in - value, not variable
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# b_in - value, not variable
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# result_out - variable with value:
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# -1 : a_in < b_in
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# 0 : a_in == b_in
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# 1 : a_in > b_in
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#
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# Written by James Bigler.
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MACRO(COMPARE_VERSION_STRINGS a_in b_in result_out)
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# Since SEPARATE_ARGUMENTS using ' ' as the separation token,
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# replace '.' with ' ' to allow easy tokenization of the string.
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STRING(REPLACE "." " " a ${a_in})
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STRING(REPLACE "." " " b ${b_in})
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SEPARATE_ARGUMENTS(a)
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SEPARATE_ARGUMENTS(b)
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# Check the size of each list to see if they are equal.
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LIST(LENGTH a a_length)
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LIST(LENGTH b b_length)
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# Pad the shorter list with zeros.
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# Note that range needs to be one less than the length as the for
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# loop is inclusive (silly CMake).
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IF(a_length LESS b_length)
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# a is shorter
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SET(shorter a)
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MATH(EXPR range "${b_length} - 1")
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MATH(EXPR pad_range "${b_length} - ${a_length} - 1")
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ELSE(a_length LESS b_length)
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# b is shorter
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SET(shorter b)
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MATH(EXPR range "${a_length} - 1")
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MATH(EXPR pad_range "${a_length} - ${b_length} - 1")
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ENDIF(a_length LESS b_length)
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# PAD out if we need to
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IF(NOT pad_range LESS 0)
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FOREACH(pad RANGE ${pad_range})
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# Since shorter is an alias for b, we need to get to it by by dereferencing shorter.
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LIST(APPEND ${shorter} 0)
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ENDFOREACH(pad RANGE ${pad_range})
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ENDIF(NOT pad_range LESS 0)
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SET(result 0)
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FOREACH(index RANGE ${range})
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IF(result EQUAL 0)
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# Only continue to compare things as long as they are equal
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LIST(GET a ${index} a_version)
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LIST(GET b ${index} b_version)
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# LESS
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IF(a_version LESS b_version)
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SET(result -1)
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ENDIF(a_version LESS b_version)
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# GREATER
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IF(a_version GREATER b_version)
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SET(result 1)
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ENDIF(a_version GREATER b_version)
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ENDIF(result EQUAL 0)
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ENDFOREACH(index)
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# Copy out the return result
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SET(${result_out} ${result})
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ENDMACRO(COMPARE_VERSION_STRINGS)
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####################################
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -pedantic -Wall -Wextra -Wformat=2 -Wformat-nonliteral -Wformat-security -Wshadow -Wpointer-arith -Wmissing-prototypes -D_GNU_SOURCE -DNK_USE_CAPABILITY")
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set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -pedantic -Wall -Wextra -Wformat=2 -Wformat-nonliteral -Wformat-security -Wshadow -Wpointer-arith -Wmissing-prototypes -D_GNU_SOURCE -DNK_USE_CAPABILITY")
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@ -21,6 +96,31 @@ if (NOT (${OSNAME} STREQUAL "Linux"))
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return()
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endif()
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set(GLIBC_DETECT_TEST_C
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"
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#include <stdio.h>
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int main(int argc, char *argv[]) {
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printf(\"%d.%d\", __GLIBC__, __GLIBC_MINOR__);
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return 0;
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}
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")
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file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/detect/glibc.c "${GLIBC_DETECT_TEST_C}\n")
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try_run(GLIBC_DETECTION GLIBC_COMPILE
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${CMAKE_CURRENT_BINARY_DIR}/detect ${CMAKE_CURRENT_BINARY_DIR}/detect/glibc.c
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RUN_OUTPUT_VARIABLE GLIBC_VERSION)
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if (GLIBC_VERSION AND GLIBC_COMPILE)
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message("glibc version detected as ${GLIBC_VERSION}")
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else()
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message("Could not detect glibc version.")
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endif()
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COMPARE_VERSION_STRINGS(${GLIBC_VERSION} "2.17" GLIBC_MUST_LINK_RT)
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if (${GLIBC_MUST_LINK_RT} LESS 0)
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message("glibc <2.17 detected; linking against librt.")
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -lrt")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lrt")
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endif()
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execute_process(
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COMMAND uname -m
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COMMAND tr "\n" " "
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5
Makefile
5
Makefile
@ -15,6 +15,9 @@ CC = gcc
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AR = ar
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RANLIB = ranlib
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CFLAGS = -O2 -s -std=gnu99 -pedantic -Wall -D_GNU_SOURCE
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# Not required for glibc >= 2.17, but older glibcs are still common.
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# The CMake build script will perform detection, but this Makefile is simple.
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LINK_LIBS = -lrt
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all: makedir ifchd-parse.o ncmlib.a ndhc
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@ -36,7 +39,7 @@ ncmlib.a: $(NCM_OBJS)
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$(RANLIB) $(BUILD_DIR)/$@
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ndhc: $(NDHC_OBJS) ifchd-parse.o
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$(CC) $(CFLAGS) $(NCM_INC) -o $(BUILD_DIR)/$@ $(subst src/,$(OBJ_DIR)/src/,$(NDHC_OBJS)) $(BUILD_DIR)/ncmlib.a $(BUILD_DIR)/objs/src/ifchd-parse.o
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$(CC) $(CFLAGS) $(NCM_INC) -o $(BUILD_DIR)/$@ $(subst src/,$(OBJ_DIR)/src/,$(NDHC_OBJS)) $(BUILD_DIR)/ncmlib.a $(BUILD_DIR)/objs/src/ifchd-parse.o $(LINK_LIBS)
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.PHONY: all clean
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