GerbilSoft/rvthtool
1
Fork 0
mirror of https://github.com/GerbilSoft/rvthtool.git synced 2025-06-18 11:35:33 -04:00
Code Issues Actions Packages Projects Releases Wiki Activity

[cmake] platform/gcc.cmake: Initial support for detecting DT_RELR.

Browse Source 
Currently only supported if using glibc-2.36 and binutils-2.38.

TODO:
- Detect more systems with DT_RELR.
- Handle cross-compiling better?
This commit is contained in:
David Korth 2022-08-05 00:43:45 -04:00
parent 08e76cc03c
commit 420fa1bc31
2 changed files with 57 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
cmake/platform/DT_RELR_Test.c Normal file
View File

@ -0,0 +1,26 @@
/**
* DT_RELR test code
*/
#include <stdlib.h>
#include <stdio.h>
// Minimum glibc version requirements.
#if defined(__GLIBC__)
# if __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 36)
# error glibc-2.36 is required for DT_RELR
# endif
#else
# error TODO: Detect DT_RELR on non-glibc platforms
#endif
void test_print(const char *a, const char *b)
{
printf("%s %s\n", a, b);
}
int main(void)
{
const char *tbl[] = {"quack", "moo"};
test_print(tbl[0], tbl[1]);
return 0;
}

31
cmake/platform/gcc.cmake
View File

@ -215,6 +215,37 @@ IF(NOT WIN32)
ENDFOREACH()
ENDIF(NOT WIN32)
# Check for -Wl,-z,pack-relative-relocs.
# Requires glibc-2.36. (TODO: Check other Unix systems.)
IF(UNIX AND NOT APPLE)
IF(_ld_out MATCHES "-z pack-relative-relocs")
IF(NOT DEFINED HAVE_DT_RELR)
MESSAGE(STATUS "Checking if the system supports DT_RELR")
# NOTE: ${CMAKE_MODULE_PATH} has two directories, macros/ and libs/,
# so we have to configure this manually.
SET(DT_RELR_SOURCE_PATH "${CMAKE_SOURCE_DIR}/cmake/platform")
# TODO: Better cross-compile handling.
TRY_RUN(TMP_DT_RELR_RUN TMP_DT_RELR_COMPILE
"${CMAKE_CURRENT_BINARY_DIR}"
"${DT_RELR_SOURCE_PATH}/DT_RELR_Test.c")
IF(TMP_DT_RELR_COMPILE AND (TMP_DT_RELR_RUN EQUAL 0))
SET(TMP_HAVE_DT_RELR TRUE)
MESSAGE(STATUS "Checking if the system supports DT_RELR - yes")
ELSE()
SET(TMP_HAVE_DT_RELR FALSE)
MESSAGE(STATUS "Checking if the system supports DT_RELR - no")
ENDIF()
SET(HAVE_DT_RELR ${TMP_HAVE_DT_RELR} CACHE INTERNAL "System supports DT_RELR")
UNSET(TMP_HAVE_DT_RELR)
ENDIF(NOT DEFINED HAVE_DT_RELR)
IF(HAVE_DT_RELR)
SET(RP_EXE_LINKER_FLAGS_COMMON "${RP_EXE_LINKER_FLAGS_COMMON} -Wl,-z,pack-relative-relocs")
ENDIF(HAVE_DT_RELR)
ENDIF(_ld_out MATCHES "-z pack-relative-relocs")
ENDIF(UNIX AND NOT APPLE)
SET(RP_SHARED_LINKER_FLAGS_COMMON "${RP_EXE_LINKER_FLAGS_COMMON}")
SET(RP_MODULE_LINKER_FLAGS_COMMON "${RP_EXE_LINKER_FLAGS_COMMON}")