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build: fix DragonWing toolchain sysroot header conflict

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The Hexagon SDK GCC's built-in sysroot has an incomplete glibc
(L_tmpnam undeclared in stdio.h).  Fix by prepending Ubuntu system
headers via -I flags, which take priority over the compiler's sysroot
paths.  Also restore the linker -L/usr/lib/aarch64-linux-gnu flags and
drop the non-existent /usr/aarch64-linux-gnu CMAKE_SYSROOT and
CMAKE_FIND_ROOT_PATH settings.  Confirmed producing aarch64 ELF binaries.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Raymond Knopp <raymond.knopp@eurecom.fr>
This commit is contained in:
Raymond Knopp
2026-05-23 16:15:37 +00:00
parent b60b1437f5
commit f93ebdc494
1 changed files with 12 additions and 10 deletions
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22
cmake_targets/cross-arm-dragonwing.cmake
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@@ -43,10 +43,16 @@ set(CMAKE_C_COMPILER "${_DW_TC}-gcc")
set(CMAKE_CXX_COMPILER "${_DW_TC}-g++")
set(CMAKE_AR "${_DW_TC}-ar")
# The SDK GCC's built-in sysroot is minimal. Append Ubuntu arm64 multiarch
# paths so that libraries installed via "apt-get install pkg:arm64" are found.
set(CMAKE_C_FLAGS_INIT "-I/usr/include/aarch64-linux-gnu")
set(CMAKE_CXX_FLAGS_INIT "-I/usr/include/aarch64-linux-gnu")
# The SDK GCC's built-in sysroot has an incomplete glibc (missing L_tmpnam and
# similar symbols in stdio.h). Override with the Ubuntu system headers by
# prepending them via -I, which takes priority over the compiler's sysroot
# search paths. /usr/include is the host glibc (architecture-neutral API);
# /usr/include/aarch64-linux-gnu has the arm64-specific bits/ and sys/ headers.
set(CMAKE_C_FLAGS_INIT "-I/usr/include/aarch64-linux-gnu -I/usr/include")
set(CMAKE_CXX_FLAGS_INIT "-I/usr/include/aarch64-linux-gnu -I/usr/include")
# Linker: search the arm64 multiarch directory so arm64 .so files are found
# before any host x86 libraries.
set(CMAKE_EXE_LINKER_FLAGS_INIT "-L/usr/lib/aarch64-linux-gnu")
set(CMAKE_SHARED_LINKER_FLAGS_INIT "-L/usr/lib/aarch64-linux-gnu")
set(CMAKE_MODULE_LINKER_FLAGS_INIT "-L/usr/lib/aarch64-linux-gnu")
@@ -54,12 +60,8 @@ set(CMAKE_MODULE_LINKER_FLAGS_INIT "-L/usr/lib/aarch64-linux-gnu")
# Direct pkg-config at the arm64 multiarch .pc files
set(ENV{PKG_CONFIG_LIBDIR} "/usr/lib/aarch64-linux-gnu/pkgconfig")
# cmake find_* commands: search Ubuntu arm64 root; never use host binaries
set(CMAKE_FIND_ROOT_PATH "/usr/aarch64-linux-gnu")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
# Tell cmake's find_library() where Ubuntu multiarch arm64 libs live
set(CMAKE_LIBRARY_PATH "/usr/lib/aarch64-linux-gnu")
set(CROSS_COMPILE 1)
set(QUALCOMM_DRAGONWING 1)