Fix RSMI_STATIC=true and add GPU section to README.md

Makefile

@@ -315,7 +315,7 @@ rocm_smi:
 	@ar -crs rocm_smi/librocm_smi64.a $$(find rocm_smi -name '*.o') $(SURPRESS) || { printf "\033[1;91mFailed to pack ROCm SMI into static library, continuing build without statically linking ROCm SMI\033[37m...\033[0m\n"; exit 0; }
 	@printf "\033[1;92m100$(P)\033[10D\033[5C-> \033[1;37mrocm_smi/librocm_smi64.a \033[100D\033[38C\033[1;93m(\033[1;97m$$(du -ah rocm_smi/librocm_smi64.a | cut -f1)iB\033[1;93m)\033[0m\n"
 	@printf "\033[1;92mROCm SMI build complete in \033[92m(\033[97m$$($(DATE_CMD) -d @$$(expr $$(date +%s 2>/dev/null || echo "0") - $(TIMESTAMP) 2>/dev/null) -u +%Mm:%Ss 2>/dev/null | sed 's/^00m://' || echo "unknown")\033[92m)\033[0m\n"
-	@$(eval override LDFLAGS += lib/rocm_smi_lib/build/rocm_smi/librocm_smi64.a -DRSMI_STATIC)
+	@$(eval override LDFLAGS += lib/rocm_smi_lib/build/rocm_smi/librocm_smi64.a -DRSMI_STATIC) # TODO: this seems to execute every time, no matter if the compilation failed or succeeded
 	@$(eval override CXXFLAGS += -DRSMI_STATIC)
 else
 rocm_smi:

README.md

@@ -33,6 +33,7 @@
 * [Compilation Linux](#compilation-linux)
 * [Compilation macOS](#compilation-macos-osx)
 * [Compilation FreeBSD](#compilation-freebsd)
+* [GPU compatibility](#gpu-compatibility)
 * [Installing the snap](#installing-the-snap)
 * [Configurability](#configurability)
 * [License](#license)
@@ -342,11 +343,7 @@ Also needs a UTF8 locale and a font that covers:
    If omitted the makefile uses the machine triple (output of `-dumpmachine` compiler parameter) to detect the target system.
 
    Append `RSMI_STATIC=true` to statically link the ROCm SMI library used for querying AMDGPU data.
-   For this to work, the `lib/rocm_smi_lib` directory must contain the RSMI source code, which can obtained using the following command:
-
-   ```bash
-   git clone https://github.com/RadeonOpenCompute/rocm_smi_lib.git lib/rocm_smi_lib
-   ```
+   See [GPU compatibility](#gpu-compatibility) for details.
 
    Use `ADDFLAGS` variable for appending flags to both compiler and linker.
 
@@ -578,6 +575,28 @@ Also needs a UTF8 locale and a font that covers:
    gmake help
    ```
 
+## GPU compatibility
+
+   Btop++ supports NVIDIA and AMD GPUs out of the box on Linux, provided you have the correct drivers and libraries.
+
+   Compatibility with Intel GPUs using generic DRM calls is planned, as is compatibility for FreeBSD and macOS.
+
+ * **NVIDIA**
+
+    You must use an official NVIDIA driver, both the closed-source and [open-source](https://github.com/NVIDIA/open-gpu-kernel-modules) ones have been verified to work.
+
+    In addition to that you must also have the `nvidia-ml` dynamic library installed, which should be included with the driver package of your distribution.
+
+ * **AMD**
+
+    AMDGPU data is queried using the [ROCm SMI](https://github.com/RadeonOpenCompute/rocm_smi_lib) library, which may or may not be packaged for your distribution. If your distribution doesn't provide a package, btop++ is statically linked to ROCm SMI with the `RSMI_STATIC=true` make flag.
+
+    This flag expects the ROCm SMI source code in `lib/rocm_smi_lib`, and compilation will fail if it's not there. The latest tested version is 5.6.x, which can be obtained with the following command:
+
+   ```bash
+   git clone https://github.com/RadeonOpenCompute/rocm_smi_lib.git --depth 1 -b rocm-5.6.x lib/rocm_smi_lib
+   ```
+
 ## Installing the snap
 [![btop](https://snapcraft.io/btop/badge.svg)](https://snapcraft.io/btop)
 

src/linux/btop_collect.cpp

@@ -30,6 +30,9 @@ tab-size = 4
 #include <arpa/inet.h> // for inet_ntop()
 #include <dlfcn.h>
 
+#if defined(RSMI_STATIC)
+	#include <rocm_smi/rocm_smi.h>
+#endif
 
 #if !(defined(STATIC_BUILD) && defined(__GLIBC__))
 	#include <pwd.h>