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cmake: Improve handling of SECP256K1_APPEND_*FLAGS options #1648

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cmake: Improve handling of SECP256K1_APPEND_*FLAGS options #1648

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0be7d3d
cmake: Enable `APPEND_*FLAGS` only for command-line generators
hebasto Dec 17, 2024
c12bc01
cmake: Fix passing `SECP256K1_APPEND_CFLAGS` to clang-cl
hebasto Dec 15, 2024
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35 changes: 19 additions & 16 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -280,19 +280,20 @@ if(SECP256K1_BUILD_CTIME_TESTS)
unset(msan_enabled)
endif()

set(SECP256K1_APPEND_CFLAGS "" CACHE STRING "Compiler flags that are appended to the command line after all other flags added by the build system. This variable is intended for debugging and special builds.")
if(SECP256K1_APPEND_CFLAGS)
# Appending to this low-level rule variable is the only way to
# Only some generators use low-level rule variables.
if(CMAKE_GENERATOR MATCHES "Make|Ninja")
# Appending to the low-level rule variables is the only way to
# guarantee that the flags appear at the end of the command line.
string(APPEND CMAKE_C_COMPILE_OBJECT " ${SECP256K1_APPEND_CFLAGS}")
endif()
set(SECP256K1_APPEND_CFLAGS "" CACHE STRING "Compiler flags that are appended to the command line after all other flags added by the build system. This variable is intended for debugging and special builds.")
if(SECP256K1_APPEND_CFLAGS)
string(REPLACE "<FLAGS>" "<FLAGS> ${SECP256K1_APPEND_CFLAGS}" CMAKE_C_COMPILE_OBJECT "${CMAKE_C_COMPILE_OBJECT}")
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Do you think this same should be done for CMAKE_C_CREATE_SHARED_LIBRARY and/or CMAKE_C_LINK_EXECUTABLE?

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Thanks! Done.

endif()

set(SECP256K1_APPEND_LDFLAGS "" CACHE STRING "Linker flags that are appended to the command line after all other flags added by the build system. This variable is intended for debugging and special builds.")
if(SECP256K1_APPEND_LDFLAGS)
# Appending to this low-level rule variable is the only way to
# guarantee that the flags appear at the end of the command line.
string(APPEND CMAKE_C_CREATE_SHARED_LIBRARY " ${SECP256K1_APPEND_LDFLAGS}")
string(APPEND CMAKE_C_LINK_EXECUTABLE " ${SECP256K1_APPEND_LDFLAGS}")
set(SECP256K1_APPEND_LDFLAGS "" CACHE STRING "Linker flags that are appended to the command line after all other flags added by the build system. This variable is intended for debugging and special builds.")
if(SECP256K1_APPEND_LDFLAGS)
string(REPLACE "<LINK_FLAGS>" "<LINK_FLAGS> ${SECP256K1_APPEND_LDFLAGS}" CMAKE_C_CREATE_SHARED_LIBRARY "${CMAKE_C_CREATE_SHARED_LIBRARY}")
string(REPLACE "<LINK_FLAGS>" "<LINK_FLAGS> ${SECP256K1_APPEND_LDFLAGS}" CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_LINK_EXECUTABLE}")
endif()
endif()

if(NOT CMAKE_RUNTIME_OUTPUT_DIRECTORY)
Expand Down Expand Up @@ -381,11 +382,13 @@ else()
message(" - LDFLAGS for executables ............ ${CMAKE_EXE_LINKER_FLAGS_DEBUG}")
message(" - LDFLAGS for shared libraries ....... ${CMAKE_SHARED_LINKER_FLAGS_DEBUG}")
endif()
if(SECP256K1_APPEND_CFLAGS)
message("SECP256K1_APPEND_CFLAGS ............... ${SECP256K1_APPEND_CFLAGS}")
endif()
if(SECP256K1_APPEND_LDFLAGS)
message("SECP256K1_APPEND_LDFLAGS .............. ${SECP256K1_APPEND_LDFLAGS}")
if(CMAKE_GENERATOR MATCHES "Make|Ninja")
if(SECP256K1_APPEND_CFLAGS)
message("SECP256K1_APPEND_CFLAGS ............... ${SECP256K1_APPEND_CFLAGS}")
endif()
if(SECP256K1_APPEND_LDFLAGS)
message("SECP256K1_APPEND_LDFLAGS .............. ${SECP256K1_APPEND_LDFLAGS}")
endif()
endif()
message("")
if(print_msan_notice)
Expand Down
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