From d8e23c1e932beeacd7433cd6aa9e2161d555254f Mon Sep 17 00:00:00 2001
From: Adrien Cassagne <kouchy@users.noreply.github.com>
Date: Tue, 5 Mar 2024 15:57:04 +0100
Subject: [PATCH] Add 'POSITION_INDEPENDENT_CODE ON' (also known as '-fPIE').
 (#99)

First thx for these very useful lib!

I encountered some issues when linking with `libcpptrace`. Typically,
here is the error I got:
```
/usr/bin/ld: lib/cpptrace/lib/libcpptrace.a(cpptrace.cpp.o): relocation R_X86_64_32S against symbol `_ZTVNSt7__cxx1115basic_stringbufIcSt11char_traitsIcESaIcEEE@@GLIBCXX_3.4.21' can not be used when making a PIE object; recompile with -fPIE
```
I just added the `POSITION_INDEPENDENT_CODE ON` flag on the targets, and
now it works like a charm :-).
---
 CMakeLists.txt              | 1 +
 README.md                   | 1 +
 cmake/OptionVariables.cmake | 1 +
 3 files changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 317177d..851c1e9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -267,6 +267,7 @@ set_target_properties(
     SOVERSION "${PROJECT_VERSION_MAJOR}"
     EXPORT_NAME "cpptrace"
     OUTPUT_NAME "cpptrace"
+    POSITION_INDEPENDENT_CODE ${CPPTRACE_POSITION_INDEPENDENT_CODE}
 )
 
 # Header files generated by CMake
diff --git a/README.md b/README.md
index 66b7c11..ccfb0ed 100644
--- a/README.md
+++ b/README.md
@@ -898,6 +898,7 @@ Other useful configurations:
   the fault of your project. Defaults to On.
 - `CPPTRACE_INSTALL_CMAKEDIR`: Override for the installation path for the cmake configs.
 - `CPPTRACE_USE_EXTERNAL_LIBDWARF=On/Off`: Get libdwarf from `find_package` rather than `FetchContent`.
+- `CPPTRACE_POSITION_INDEPENDENT_CODE=On/Off`: Compile the library as a position independent code (PIE). Defaults to On.
 
 Testing:
 - `CPPTRACE_BUILD_TESTING` Build small demo and test program
diff --git a/cmake/OptionVariables.cmake b/cmake/OptionVariables.cmake
index 022bfd8..5589a8d 100644
--- a/cmake/OptionVariables.cmake
+++ b/cmake/OptionVariables.cmake
@@ -164,6 +164,7 @@ option(CPPTRACE_CONAN "" OFF)
 option(CPPTRACE_VCPKG "" OFF)
 option(CPPTRACE_SANITIZER_BUILD "" OFF)
 option(CPPTRACE_WERROR_BUILD "" OFF)
+option(CPPTRACE_POSITION_INDEPENDENT_CODE "" ON)
 
 mark_as_advanced(
   CPPTRACE_BACKTRACE_PATH